minetest.register_craftitem('maxhp:lifeforce', {
   _doc_items_longdesc = "Increases max HP by 5 up to 50.",
   description = 'Life Force',
   inventory_image = 'maxhp_lifeforce.png',
   on_use = function(itemstack, user, pointed_thing)
      if maxhp.max_hp_change(user, 5, 50) then
         itemstack:take_item(1); return itemstack
      end
   end
})
